Step 3. Click on [Next] to continue the procedure. If the Windows popup
"Digital Signature Not Found" message, press [Yes] to continue the
installation.

Step 4. Finally, select to restart the system and press [Finish] to complete
the installation.
Windows Vista, Windows7 :
Step 1. Run the setup.exe program to start the installation.

Step 2. Click on [Next] to continue the procedure. If the Windows popup
"Windows can't verify the publisher of this driver software" message,
press "Install this driver software anyway" to continue the installation.

Step 3. Finally, select to restart the system and press [Finish] to complete
the installation.

--------------------------
Update Driver:
--------------------------

Windows 2000 , XP :
Step 1. Follow Step 2,3,4 described in [Setup at first time] above to complete
the procedure.
Windows Vista, Windows7 :
Step 1. Run setup.exe, it will remove the original driver in your system.
Step 2. Click "Next" to remove the original audio driver in your system.
Step 3. Once after the original driver removed , reboot the computer.
Step 4. Please go back to the new driver package after computer restarted.
Step 5. Run setup.exe, it will install the new audio driver then.
--------------------------
Remove Driver:
--------------------------
Windows 2000 , XP :
Step 1. Go to Start\Settings\Control Panel.
Step 2. Select [Add or Remove Programs] icon.
Step 3. Select "Realtek High Definition Audio Driver" and press [Remove]
button.
Step 4. Click on [Yes] to finish the uninstallation.
Step 5. At the end of the procedure, select to restart the system and press
[Finish] to complete the uninstallation.
Windows Vista, Windows7 :
Step 1. Go to Start\Settings\Control Panel.
Step 2. Select [Programs] icon.
Step 3. Select [Programs and Features] icon.
Step 4. Select "Realtek High Definition Audio Driver" and press [uninstall] button.
Step 5. Click on [Yes] to finish the uninstallation.
Step 6. At the end of the procedure, select to restart the system and press
[Finish] to complete the uninstallation.

Here's other similar drivers that are different versions or releases for different operating systems: